robertson



(No Model.)

J. H. ROBERTSON. Mat. No. 232,760. Patented Sept. 28,1880.

ATTORNEYS.

'zTa-v" wAsmNaTou. n, c.

N.PETERS, PHOTO-L1TNDGRAFHER J ft. WQ

UNITED STATES JOHN H. ROBERTSON, OF NEW YORK, N. Y.

lVl AT.

SPECIFICATION forming part of Letters Patent No. 232,760, dated September 28, 1880.

Application led August 11, 1880.

To all whom t may concern:

Be it known that I, J oHN H. ROBERTSON, of the city, county, and Slate of New York, have invented a new and Improved Mat, of which the following is a specification.

The object of this invention is to provide a more rigid, strong, and durable mat, especially designed for loors ot' cars.

The invention consists of longitudinal metal bars provided with alternate mortsed and tenoned ends, and composed ot' series of sockets united by webs and ot wooden transverse rods entered through said sockets and held therein by vertical pins.

Figure l is a plan ofthe mat, partly in section. Fig. 2 is a cross-section ot' the saine on line a: x, Fig. 1.

Similar letters ot' reference indicate corresponding parts.

In the drawings, A A represent the longitudinal nl etal bars, composed of alternate sockets a c, united hy alternate webs b l), each bar A having a tonou, c, on one end and a bifurcated mortise, d, on the opposite end, to tit into correspondingtenons and mortises in siniilar bars A when more than one mat or 1natsections are designed to be formed into one.

B B are the transverse wooden rods entered through the sockets c a and held therein by pins ff.

Ordinarily the mats are constructed, as herein shown, with three bars, A, placed parallel with each other at equal distances apa-rt, and the parallel wooden rods B B, passed entirely through the sockets ot' the central bar (No model.)

A and into the sockets of the side bars A A, so that the ends ofthe rods B B shall be flush with the outer edges of said sockets a a..

C O in the drawings, Fig. l, represent portions ot' like mats, showing the manner in which the mats or inat-sections are laid together.

Mats in some respects resembling mine have been constructed in which the wooden rods are held by metal rods passing through them and kept at suitable distances apart by wooden washers set on the metal rods between the wooden rods. Amat so constructed is, however, liable to distortion from thebendingof the metal rods and breaking ofthe wooden washers, and the wooden rods are greatly weakened by the holes through which the metal rods pass. In this device these objections are avoided.

Ha-ving thus described my invention, I claim as new and desire to secure by Letters Patent- 1. As an improved manufacture, a mat constructed substantially as herein shown and described, consisting ofthe metal barsA A, com posed ot alternate sockets a a and webs b b, and transverse wooden rods BB, as set forth.

2. In a mat, the bars A A, composed of alternate sockets c a, held rigidly together by webs b b, substantially as herein shown and described.

JOHN H. ROBERTSON. Witnesses:

JOHN LAPPIN, J osErH E. STEGEE. 

